HETEROGENEOUS DYNAMIC STRESS DROPS ON ASPERITIES OF INLAND EARTHQUAKES CAUSED BY VERY LONG FAULTS AND THEIR APPLICATION TO THE STRONG GROUND MOTION PREDICTION

Abstract

 We proposed a procedure for evaluating fault parameters taking into account of heterogeneous dynamic stress drops on the asperities, and calculated strong ground motions. We compiled the stress drop data on the asperities of earthquakes caused bystrike-slip faults and reverse faults. In order to establish fault models for strong motion predictions, we applied the log-normal distribution to the stress drop data, and examined a procedure for assigning heterogeneous dynamic stress drops to each asperity by using the obtained log-normal distributions. The strong ground motions predicted by using this proposed procedure had larger variations of the peak ground accelerations and velocities than those with uniform dynamic stress drops on the asperities, while the averages were almost same.